3-20
CARE OF HYDRAULIC OIL
The hydraulic system contains many highly pressurized, precision components. To
protect these, it is very important to keep the hydraulic oil clean, at proper temperature,
within the oil specification and to the proper fill level.
The IC-35 is equipped with a 100-mesh suction strainer, a 10-micron suction filter, a
breather filter, a 10-micron, return-line filter and a 14 gallon (53 L) tank. The filters must
be changed after the first 100 engine hours to eliminate the contaminants generated
during run-in. Thereafter, they are to be changed at every 500 hour maintenance
interval.
The filters are located under the deck cover. Clean the filter and the surrounding parts
with steam or pressure washer before changing, to prevent dirt from falling into the clean
oil tube. To minimize oil loss, close the shutoff valves under the tank. Be sure shutoff
valves are fully opened before starting engine.
Remove the filter elements and catch the hydraulic oil in a clean container. Pour the
remaining oil out of the old elements into the clean container and inspect the oil for water
and excessive contaminants. If water is found, the oil should be changed in the
reservoir and purged out of the cylinders. If excessive particles are found, the source
should be located and fixed, and the oil should be purged.
Lubricate each new element seal and install the new elements. Open the shutoff valves.
Run the engine and check for any leaking around the seals.
The hydraulic oil should be changed every 1000 hours or once a year whichever is
sooner. Wash the oil tank and filters before changing the oil. Retract the telescope,
boom lift and outrigger cylinders. Leave the shutoff valves open and remove the drain
plug. Catch the oil and dispose of it properly. Clean the breather element in the fill cap
with solvent and compressed air. Clean out the tank with solvent and compressed air.
Replace the filters as described previously and refill the tank with new hydraulic oil that
meets the specifications in the table below. Start the engine and run it at low idle for 15
minutes to filter the new oil. Then cycle all of the hydraulic cylinders at low idle and low
pressure. Add hydraulic oil to the dipstick level mark, if necessary, with cylinders
retracted.
Courtesy of Crane.Market
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